參數(shù)資料
型號(hào): LMC6762AIM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運(yùn)動(dòng)控制電子
英文描述: Dual MicroPower Rail-To-Rail Input CMOS Comparator with Push-Pull Output
中文描述: DUAL COMPARATOR, 5000 uV OFFSET-MAX, 4000 ns RESPONSE TIME, PDSO8
封裝: SOP-8
文件頁(yè)數(shù): 10/13頁(yè)
文件大?。?/td> 317K
代理商: LMC6762AIM
Typical Applications
(Continued)
A monostable multivibrator has one stable state in which it
can remain indefinitely. It can be triggered externally to an-
other quasi-stable state. A monostable multivibrator can thus
be used to generate a pulse of desired width.
The desired pulse width is set by adjusting the values of C
2
and R
. The resistor divider of R
and R
can be used to de-
termine the magnitude of the input trigger pulse. The
LMC6762 will change state when V
<
V
2
. Diode D
pro-
vides a rapid discharge path for capacitor C
to reset at the
end of the pulse. The diode also prevents the non-inverting
input from being driven below ground.
Bi-Stable Multivibrator
A bi-stable multivibrator has two stable states. The reference
voltage is set up by the voltage divider of R
and R
. A pulse
applied to the SET terminal will switch the output of the com-
parator high. The resistor divider of R
, R
, and R
now
clamps the non-inverting input to a voltage greater than the
reference voltage. A pulse applied to RESET will now toggle
the output low.
Zero Crossing Detector
A voltage divider of R
and R
establishes a reference volt-
age V
at the non-inverting input. By making the series resis-
tance of R
and R
equal to R
, the comparator will switch
when V
= 0. Diode D
insures that V
3
never drops below
0.7V. The voltage divider of R
and R
then prevents V
2
from going below ground. A small amount of hysteresis is
setup to ensure rapid output voltage transitions.
Oscillator
Figure 9 shows the application of the LMC6762 in a square
wave generator circuit. The total hysteresis of the loop is set
by R
, R
and R
. R
and R
provide separate charge and
discharge paths for the capacitor C. The charge path is set
through R
and D
. So, the pulse width t
is determined by
the RC time constant of R
and C. Similarly, the discharge
path for the capacitor is set by R
and D
. Thus, the time t
2
between the pulses can be changed by varying R
, and the
pulse width can be altered by R
. The frequency of the out-
put can be changed by varying both R
4
and R
5
.
DS012320-15
FIGURE 7. Bi-Stable Multivibrator
DS012320-16
FIGURE 8. Zero Crossing Detector
DS012320-19
FIGURE 9. Square Wave Generator
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